But a new study suggests this limit is far more generous than experts once thought, meaning that the conditions needed to sustain existence may not be that rare.
According to a new pair of studies in the journal Monthly Notices of the Royal Astronomical Society, there's a decent chance that life-fostering planets could exist in a parallel universe - even if that universe were being torn apart by dark energy.
Professor Richard Bauer of the Institute of Computational Cosmology at Durham University stated: "The formation of stars in the universe is a battle between the attraction of gravity and the exclusion of dark energy". The members of the research team were based in England Australia and the Netherlands.
"The Multiverse was previously thought to explain the observed value of dark energy as a lottery - we have a lucky ticket and live in the Universe that forms handsome galaxies which permit life as we know it", said co-lead author Dr. Luke Barnes, a researcher at Western Sydney University and the University of Sydney.More news: Indonesia police shoot dead four men after attack on Riau HQ
Adding larger amounts would cause such a rapid expansion that it would dilute matter before any stars, planets or life could form.
This opens up the prospect that life could be possible throughout a wider range of other universes, if they exist, the researchers said.
If we live in a Multiverse, we'd expect to observe much more dark energy than we do - perhaps 50 times more than we see in our Universe.
Some could have similar Earth-like planets, societies and even people.
Current theories of the origin of our Universe predict much more dark energy in the Universe than is observed. It's more special than it needs to be for life.
However, the results were unexpected and could be problematic as they cast doubt on the ability of the theory of a Multiverse to explain the observed value of dark energy.
Researcher Richard Bower of the Durham University said that according to him, a "new law of physics" should be looked for in order to completely explain the mysterious "property of our Universe", which can not be done appropriately by the theory of Multiverse. "So why is there so much dark energy in our universe?" And they find out that Dark energy plays an important role to form such conditions.More news: Georgia Tech Golf shoots five under on Day 2 of NCAA Regional
"I think we should look for a new physical law to explain this odd characteristic of our universe, and the theory of multiverses has little effect on the discomfort of saving physicists".
The multiverse theory suggests that our cosmos is one of a number of different "alternate" universes.
It may sound far-fetched but the concept is the subject of serious debate among physicists. Numerous researchers have long argued that the idea is not possible to test.
Just five per cent the observable universe consists of known material such as atoms and subatomic particles.
It can not be seen directly with telescopes, but astronomers know it to be out there because of its gravitational effects on known matter.
"That does not mean that the room around you does not exist".
Dark matter is thought to be the gravitational "glue" that holds the galaxies together.More news: ABC says "Roseanne" will concentrate on family, not politics